Control system of speed (tempostat) – general information and check of serviceability of functioning

Tempostat allows to support automatically chosen speed of the movement of the car. The servomotor of a tempostat is located in a motive compartment, fixed on a mudguard of the left wing and by a cable is connected to draft of a butterfly valve. The main components of system are the servomotor, the sensor switch of stoplights, switches of management, sensors of speed and executive relays. Check of separate functions of system demands use of the special diagnostic equipment and its performance lies outside qualification of the average amateur mechanic. The description only of procedures of the most general checks allowing to establish the reasons of the most typical refusals of a tempostat is given below.

PERFORMANCE ORDER

1. Find a safety lock of a tempostat and check its state (see Safety locks - the general information). 2. Operation of the foot brake of the sensor switch of stoplights reacting to squeezing of a pedal has to lead to shutdown of a tempostat. Ask the assistant to squeeze out a brake pedal and make sure of serviceability of operation of stoplights. 3. If stoplights do not react to squeezing of a pedal, find out a cause of failure and repeat check of serviceability of functioning of a tempostat.

4. Check a condition of the driving cable laid from assembly of the servomotor/amplifier of a tempostat (see an accompanying illustration) to draft of a butterfly valve. Replace the damaged or worn-out cable.

5. Monitoring of speed of the movement of the car is the basis for functioning of a tempostat. The sensor of speed is placed in transmission, the description of its check is provided in the Head of the Control system of the engine of the present manual. 6. Make trial runs of the car. If it was not succeeded to eliminate violation of functioning of a tempostat in the course made corrections, drive away the car on car repair shop for more detailed diagnostics of system with use of the special equipment.